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The Attached-at-the-Hip Couple
By all accounts, you get along famously. But "fused" pairs, Hendrix says, may harbor a fear of separation and can blend together with such strong dependence that they lack any kind of individual identity.

This is especially true when you're with each other to the exclusion of everyone else, says Peggy Papp, editor of Couples on the Fault Line and a therapist at the Ackerman Institute for the Family in New York. "One partner can end up feeling trapped, smothered by the relationship, and that they can't possibly express a need for independence without the other feeling totally betrayed," she says. "So they stay and then suddenly they can't tolerate it and they're gone." One warning sign of a split is a mate who seems newly distracted or "just not there anymore," she says.